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Finding the Fourth Proportional to 339,989.76, 509,985.28 and 118,374.40

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Solution

The fourth proportional to 339,989.76, 509,985.28 and 118,374.40 is: 177,561.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,989.76 : 509,985.28 = 118,374.40 : x
  2. Step 2: Convert to fraction form
    339,989.76/509,985.28 = 118,374.40/x
  3. Step 3: Cross multiply
    339,989.76x = 509,985.28 × 118,374.40
  4. Step 4: Simplify right side
    339,989.76x = 60,369,201,528.83
  5. Step 5: Solve for x
    x = 60,369,201,528.83/339,989.76
  6. Step 6: Final answer
    x = 177,561.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.